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Finding the Fourth Proportional to 78,661.52, 108,446.76 and 76,215.44

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Solution

The fourth proportional to 78,661.52, 108,446.76 and 76,215.44 is: 105,074.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,661.52 : 108,446.76 = 76,215.44 : x
  2. Step 2: Convert to fraction form
    78,661.52/108,446.76 = 76,215.44/x
  3. Step 3: Cross multiply
    78,661.52x = 108,446.76 × 76,215.44
  4. Step 4: Simplify right side
    78,661.52x = 8,265,317,529.97
  5. Step 5: Solve for x
    x = 8,265,317,529.97/78,661.52
  6. Step 6: Final answer
    x = 105,074.47

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.